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The Mets will be without captain David Wright for an undetermined amount of time due to an injured left shoulder.

The 31-year-old third baseman apparently injured the shoulder while trying to steal a base earlier this month. He said he felt it wasn’t a big deal and could play through it, but he somehow tweaked the injury on Thursday night and was scratched from Friday night’s game in Pittsburgh.

Wright was to travel back to New York for an MRI.

“I did something to my shoulder, it was just something I could play through and feel productive out there,” Wright said Friday. “It was not an issue, but then last night, on a couple different occasions I seemed to reaggravate it. It got worse. I was hoping to be able to push through it, but they obviously shut that down.

“We’ll follow the protocol like normal,” Wright added. “I’ll head back for an MRI and hopefully it would just be some rest and an injection. Hopefully I’ll be back in a couple days.”

Eric Campbell was to fill in for Wright at third on Friday night.

The timing couldn’t be worse for Wright and the Mets, who entered play Friday in last place in the NL East. In the second year of an eight-year, $138 million contract, Wright is hitting .277 with six home runs and 41 RBI this season. He has hit in 10 straight games, going 15-for-39 with two homers and seven RBI, with an RBI in eight of his last nine games.

Wright said he will have the the MRI with team doctors at the Hospital for Special Surgery on Saturday.